From a6a2f9372c492c2e6ca4404b372054b1fd82e1ee Mon Sep 17 00:00:00 2001
From: Arthur Heymans <arthur@aheymans.xyz>
Date: Mon, 25 Nov 2019 19:58:36 +0100
Subject: arch/x86/exit_car.S: Make sure _cbmem_top_ptr hits dram

INVD is called below so if postcar is running in a cached environment
it needs to happen.

NOTE: postcar cannot execute in a cached environment if clflush is not
supported!

Change-Id: I37681ee1f1d2ae5f9dd824b5baf7b23b2883b1dc
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37212
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
---
 src/include/cpu/x86/cache.h | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'src/include/cpu')

diff --git a/src/include/cpu/x86/cache.h b/src/include/cpu/x86/cache.h
index 01b202eb1a..62341104a4 100644
--- a/src/include/cpu/x86/cache.h
+++ b/src/include/cpu/x86/cache.h
@@ -8,6 +8,8 @@
 #define CR0_CacheDisable	(CR0_CD)
 #define CR0_NoWriteThrough	(CR0_NW)
 
+#define CPUID_FEATURE_CLFLUSH_BIT 19
+
 #if !defined(__ASSEMBLER__)
 
 static inline void wbinvd(void)
-- 
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